package com.wframe.framework.spring;

import org.springframework.context.*;


public class SpringContextHolder implements ApplicationContextAware {

    private static ConfigurableApplicationContext  applicationContext;

    /**
     * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextHolder.applicationContext =(ConfigurableApplicationContext)applicationContext;
    }
    
    

    /**
     * 取得存储在静态变量中的ApplicationContext.
     */
    public static ConfigurableApplicationContext getApplicationContext() {
        checkApplicationContext();
        return applicationContext;
    }
    
    /**
     * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        checkApplicationContext();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(Class<T> clazz) {
        checkApplicationContext();
        java.util.LinkedHashMap beanmap=(java.util.LinkedHashMap)SpringContextHolder.getApplicationContext().getBeansOfType(clazz);
		if(beanmap!=null){
			return (T)beanmap.values().iterator().next();
		}
        return null;
    }

    private static void checkApplicationContext() {
        if (applicationContext == null)
            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextUtil");
    }

}
